It's a tough call. That INT reminded me of Montana's INT against the Giants in 1986 (except Brady didn't get knocked out). Those Giants could do no wrong that day, and were in Montana's face all game. The Broncos were in Brady's face all day, and the Steelers were in Manning's face all day. See a theme there ? Why we went away from the same gameplan we had against Jacksonville, I'll never know. Plummer basically played without pressure. But why rehash old news.
He certainly didn't deserve an A or A-, I agree with a C-, or even D, even though he passed for an impressive 341 yards despite Broncos in his face all game, his first INT was the turning point of the game. Also his accuracy was pretty poor (see the afore mentioned pressure). All QB's seem human when they have guys hitting them all game, and in their faces all game, we are just used to Brady finding a way to beat that.
Look, as Patriot's fans, we are all spoiled somewhat, we expect Brady to win every playoff game he ever plays, but that can't happen, all of the greats lose. He didn't lose the game by himself, there were 3 other costly turnovers, and he tried his best to overcome the mistakes, but the whole team deserves a C- or D. Special teams deserves the F.
I wouldn't be too harsh on someone giving Brady an F, it's not too far off from the truth. But we all know what we have here in Brady, he is a Hall of Famer in the making who will be back strong next year.